Inner iron core fixing structure of electromagnetic pump

Abstract

The utility model discloses an electromagnetic pump inner iron core fixing structure which comprises a pump groove inner wall, an inner pipe and an inner iron core set, and a plurality of wedge-shaped blocks are arranged between the inner iron core set and the two ends of the inner pipe in the circumferential direction. One surface of the wedge-shaped block is an inclined surface, the tip part is close to the middle part of the inner pipe, and the other end extends out of the end part of the inner pipe. In the assembling process, the wedge-shaped plate can be adjusted, an assembling gap needed by the inner iron core and the inner wall of the pump groove is reserved, the inner iron core and the inner wall of the pump groove can be assembled easily, meanwhile, the requirement for the machining precision of the silicon steel sheet of the inner iron core is greatly lowered, and cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of fluid machinery, and specifically relates to a core fixing structure for an electromagnetic pump. Background Technology

[0002] There are many types of electromagnetic pumps, among which the three-phase cylindrical induction electromagnetic pump is the most widely used. Its basic working principle is similar to that of a linear motor. When three-phase alternating current is passed through the three-phase windings in the stator core, a traveling wave magnetic field is generated, which induces a current in the liquid metal in the annular flow channel of the pump groove. The interaction force between the current and the magnetic field (i.e., the Lorentz force) causes the liquid metal to move in the direction of the traveling wave, and a pressure difference is generated between the pump inlet and outlet.

[0003] The inner core, located inside the pump groove, primarily serves to provide a closed loop for the magnetic field generated by the primary winding and to support the inner wall of the pump groove, which bears external pressure. In conventional manufacturing, the inner core is first laminated and then fitted onto the pump groove wall. If the assembly gap is too large, the inner core will not provide sufficient support to the pump groove wall, leading to damage; if the assembly gap is too small, it will significantly increase processing costs and assembly difficulty. Furthermore, the presence of gaps can cause deformation and vibration of the inner core. Therefore, the fixing structure of the inner core in an electromagnetic pump is a crucial factor affecting the manufacturing cost and operational reliability of the pump.

[0004] Chinese Patent Publication No. CN115459548B, published on March 3, 2023, discloses a utility model entitled "An Electromagnetic Pump". This application discloses an electromagnetic pump, including a pump body with a receiving space; a first end cap disposed at both ends of the pump body and connected to the pump body; and an inner iron core comprising a central cylinder and several first iron cores, the latter at least partially surrounding the central cylinder and arranged in a rib-like manner. The utility model lacks a fixed structure between the inner iron core and the central cylinder, significantly increasing assembly difficulty. The assembly gap is not adjustable, and the processing and assembly of the inner iron core are challenging, increasing costs. Utility Model Content

[0005] To address the aforementioned issues, this utility model discloses an inner core fixing structure for an electromagnetic pump. By setting radially adjustable clamping structures—wedge plates—at both ends of the inner core, assembly gaps are eliminated, allowing the inner core to fit tightly against the inner wall of the pump groove, providing good support, reducing the risk of component failure and the difficulty of processing and assembling the inner core, and saving costs.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an inner core fixing structure for an electromagnetic pump, comprising an inner wall of a pump groove, an inner tube, and an inner core assembly installed between the two. Several wedge-shaped blocks are arranged circumferentially between the inner core assembly and both ends of the inner tube. The wedge-shaped blocks have a fan-shaped annular cross-section, one side is an inclined surface, the pointed end is close to the middle of the inner tube, and the other end extends beyond the end of the inner tube. During assembly, the wedge-shaped plates can be adjusted to leave the required assembly gap between the inner core and the inner wall of the pump groove, making the assembly of the inner core and the inner wall of the pump groove easier. This also significantly reduces the machining accuracy requirements of the silicon steel sheet for the inner core, saving costs.

[0007] Preferably, several baffles are evenly arranged circumferentially between the inner wall of the pump trench and the inner pipe, and each inner iron core is disposed between the baffles. This ensures that the inner wall of the pump trench and the inner pipe are arranged coaxially, enhances the stability and structural strength of the inner iron core, reduces the displacement of the inner iron core caused by vibration or thermal expansion, and thus improves the operational stability and lifespan of the electromagnetic pump.

[0008] Preferably, the wedge block is located within the area comprised of the inner tube, the partition, and the inner core. Placing the wedge block between these components ensures that it functions optimally when securing the inner core. By adjusting the position of the wedge block and pressing the inner core, the required assembly clearance between the inner core and the inner wall of the pump groove can be achieved.

[0009] Preferably, the inclined surface of the wedge block contacts the outer side of the inner tube, and the outer side is in contact with the inner side surface of the inner iron core. This ensures the adjustment function of the wedge block while uniformly transmitting the force of the wedge block to the inner iron core.

[0010] Preferably, the width of the outer surface of the wedge block is the same as the width of the inner surface of the inner core. This ensures that the wedge block transmits pressure evenly, avoiding structural deformation or damage caused by uneven pressure.

[0011] Preferably, the inclination angle of the wedge block's inclined surface is 2 to 5 degrees. By adjusting the contact point between the wedge block's inclined surface and the end of the inner tube, the degree of compression of the inner iron core by the wedge block can be adjusted, thereby adjusting the assembly gap between the inner iron core and the inner wall of the pump groove.

[0012] Preferably, the outer side of the inner iron core fits snugly against the inner side of the pump groove, with a gap between the inner side and the inner tube. This allows the assembly distance between the inner iron core and the inner wall of the pump groove to be adjustable.

[0013] Preferably, the wedge block has a fan-shaped annular cross-section, and the length of the inner tube is shorter than the length of the inner iron core. The fan-shaped annular wedge block can ensure a larger contact area with the inner iron core, thereby enhancing the fixing force.

[0014] The beneficial effects of this utility model are as follows: By setting radially adjustable clamping structures—wedge plates—at both ends of the inner iron core, this utility model eliminates the assembly gap, allowing the inner iron core to fit tightly against the inner wall of the pump groove, providing good support and greatly reducing the risk of buckling and damage to the inner wall of the pump groove due to external pressure; at the same time, it reduces the difficulty of processing and assembling the inner iron core and saves costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0017] Figure 3 for Figure 1 Enlarged view at point B.

[0018] Figure 4 This is a schematic diagram of the structure of the wedge plate of this utility model.

[0019] Reference numerals in the attached drawings: 1: Inner wall of pump trench; 2: Variable diameter head; 3: Pressure plate; 4: Inner pipe; 5: Inner iron core; 6: Partition plate; 7: Wedge block; 7.1: Inclined surface. Detailed Implementation

[0020] An inner core fixing structure for an electromagnetic pump mainly includes an inner wall 1 of the pump groove, an inner tube 4, and several inner cores 5 installed between the two, as well as several wedge blocks 7 arranged circumferentially between the inner core 5 and the inner tube 4. One side of the wedge block 7 is an inclined surface 7.1, with its pointed end close to the middle of the inner tube 4, and the other end extending beyond the end of the inner tube 4. This design allows for easy assembly of the inner core 5 and the inner wall 1 of the pump groove by adjusting the wedge blocks 7, while also significantly reducing the machining accuracy requirements of the silicon steel sheets of the inner core 5 and saving costs.

[0021] like Figure 1 and Figure 2As shown, in the electromagnetic pump core fixing structure of this utility model, the partition plate 6, inner core 5, wedge block 7, inner tube 4, and pressure plate 3 are arranged in the closed cavity formed by the inner wall 1 of the pump groove and the reducing head 2. The inner wall 1 of the pump groove is designed as the outermost structure, and the inner tube 4 is installed inside it. The length of the inner tube 4 is designed to be less than the length of the inner wall 1 of the pump groove. This design helps to form a certain space between the inner wall 1 of the pump groove and the inner tube 4, so as to facilitate the subsequent installation of the partition plate 6 and the inner core 5. At the same time, the diameter of the inner tube 4 is also designed to be less than the diameter of the inner wall 1 of the pump groove, so as to ensure that the inner tube 4 can be smoothly placed inside the inner wall 1 of the pump groove and that there is enough space for the arrangement of other components. In the space between the inner wall 1 of the pump groove and the inner tube 4, 6 to 8 partition plates 6 of the same width are evenly arranged circumferentially. In this embodiment, eight partition plates 6 are selected to ensure the uniformity and symmetry of the structure. The design of the partition plates 6 not only enhances the stability of the entire structure, but also provides necessary support for the inner core 5. One end of the baffle 6 contacts the inner surface of the pump trench inner wall 1, and the other end contacts the outer surface of the inner tube 4. This design allows the baffle 6 to be evenly distributed across the entire circumference, thus ensuring the coaxial arrangement of the inner tube 4 and the pump trench inner wall 1. The length of the baffle 6 is equal to the length of the inner iron core 5, greater than the length of the inner tube 4, and slightly less than the length of the pump trench inner wall 1. This design ensures that the baffle 6 can completely cover the inner iron core 5, while also providing space for the wedge block 7. The use of the baffle 6 can also reduce the displacement of the inner iron core 5 caused by vibration or thermal expansion, thereby improving the operational stability and lifespan of the electromagnetic pump. The central axis and the axis of symmetry of the inner tube 4 and the pump trench inner wall 1 coincide, and the center of the inner tube 4 and the pump trench inner wall 1 coincide. The inner iron core 5 is the core component of the electromagnetic pump, responsible for sensing the electromagnetic field and driving the fluid. Groups of inner iron cores 5 are arranged between the inner tube 4 and the pump trench inner wall 1. In this embodiment, eight groups of inner iron cores 5 are selected. These inner iron cores 5 are made of high-quality silicon steel sheets with good magnetic permeability and high resistivity, ensuring that the electromagnetic pump can efficiently convert electrical energy into magnetic energy during operation, thereby driving the fluid flow. The cross-section of the inner iron core 5 is designed as a fan-shaped ring, with a width smaller than the gap between the inner wall 1 of the pump groove and the inner iron core 5, reserving assembly space for the wedge plate, which facilitates the adjustment of the assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove by the wedge plate. Eight sets of inner iron cores 5 are arranged symmetrically around the center of the inner tube 4 along the circumferential direction, and each set of inner iron cores 5 is separated by a partition 6. The width of the partition 6 is designed to be greater than the width of the inner iron core 5. This design not only ensures that the partition 6 can effectively separate the inner iron cores 5, but also provides additional support, enhancing the stability of the entire structure.

[0022] A gap of approximately 5mm is left between the inner tube 4 and the inner iron core 5. This gap is crucial as it provides the necessary space for the installation and adjustment of the wedge plate. During assembly, the assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove can be easily controlled by precisely adjusting the position of the wedge plate, thus ensuring a tight fit between them. This design not only simplifies the assembly process of the inner iron core 5 and the inner wall 1 of the pump groove but also significantly reduces the machining accuracy requirements of the silicon steel sheet of the inner iron core 5, thereby saving costs and improving economic efficiency during production. Furthermore, after the wedge plate applies appropriate axial force to the inner iron core 5, the pressure plate 3 needs to be fixed to one end of the inner iron core 5 to press and fix its position. The pressure plate 3 is designed as a ring, with its ring width approximately equal to the width of the inner iron core 5. This design ensures a tight fit between the pressure plate 3 and the inner iron core 5, provides uniform pressure distribution, avoids local stress concentration, and enhances the stability and durability of the entire structure. The fixing of the pressure plate 3 not only improves the fixing effect of the inner iron core 5, but also helps to reduce the vibration and displacement that may occur to the inner iron core 5 during operation, thereby improving the operational stability and lifespan of the electromagnetic pump. After the pressure plate 3 is fixed, the next step is to install the reducing head 2 at both ends of the inner wall 1 of the pump groove. The installation of the reducing head 2 is a key part of the entire structure, because it encloses the components such as the baffle 6, inner iron core 5, wedge block 7, inner tube 4, and pressure plate 3 in a closed cavity formed by the inner wall 1 of the pump groove and the reducing head 2.

[0023] The inner core 5 has a fan-shaped annular cross-section. Its inner side fits against the outer side of the wedge plate, and its outer side fits tightly against the inner surface of the pump groove inner wall 1. The curvature of the outer side of the inner core 5 is the same as the curvature of the inner surface of the pump groove inner wall 1, and the curvature of the inner surface of the inner core 5 is the same as the curvature of the outer side of the wedge plate of the inner tube 4. This tight fit ensures that the inner core 5 can distribute the force evenly when under pressure, reducing local stress concentration and thus improving the durability of the entire structure. During assembly, the wedge plate plays a crucial role. It applies a clamping force to the inner core 5 through the inner tube 4, causing the inner core 5 to move closer to the pump groove inner wall 1, thereby reducing the assembly gap between the inner core 5 and the pump groove inner wall 1. This clamping force is adjusted through the inclined surface 7.1 of the wedge plate, which allows for convenient adjustment and ensures the fixation of the inner core 5 without adding extra complexity. When adjustments to the assembly clearance are needed to accommodate different operating conditions or for maintenance, the operator can easily adjust the clamping force of the wedge plate on the inner core 5 by simply pressing it towards the center or pulling it away. This adjustment method is simple and intuitive, requiring no complex tools or additional manpower, making the adjustment of the assembly clearance between the inner core 5 and the inner wall 1 of the pump trench convenient and quick. This method allows for easy and precise fitting between the inner core 5 and the inner wall 1 of the pump trench, ensuring the secure fixation of the inner core 5 during both initial assembly and subsequent maintenance. Furthermore, this design allows for fine-tuning of the position of the inner core 5 without disassembling the entire structure, which is highly advantageous for on-site maintenance and rapid response. It reduces maintenance time and costs, improving equipment availability and economic efficiency.

[0024] like Figure 2 , Figure 3 and Figure 4As shown, in this invention, the wedge block 7 is a key structure for adjusting the assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove. Several wedge blocks 7 are arranged circumferentially between the inner iron core 5 and the inner tube 4. The wedge blocks 7 are centrally symmetrically arranged around the center of the inner tube 4. This embodiment uses eight wedge blocks 7, and the design of these wedge blocks 7 is crucial to this invention. The main body of the wedge block 7 is a curved plate, one side of which is an inclined surface 7.1 with an inclination angle of 2–5 degrees. This precise angle design allows the wedge block 7 to apply appropriate clamping force to the inner iron core 5, and can be finely adjusted according to actual assembly needs to adapt to different assembly gap requirements. The pointed end of the wedge block 7 penetrates into the middle of the inner tube 4, while the thicker end extends a certain distance beyond the end of the inner tube 4. This design allows the contact point between the inclined surface 7.1 and the end of the inner tube 4 to be adjusted as needed, thereby adjusting the squeezing force of the wedge block 7 on the inner iron core 5, and thus finely adjusting the assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove. This adjustment mechanism greatly facilitates the assembly process and significantly reduces the machining precision requirements of the silicon steel sheets in the inner core 5, saving costs. The inclined surface 7.1 of the wedge block 7 contacts the outer side of the inner tube 4, and the outer side fits against the inner side of the inner core 5. The curvature of the outer side and the inner side of the inner core 5 are the same, ensuring a tight fit between the wedge block 7 and the inner core 5. The cross-section of the wedge block 7 is a fan-shaped ring, and the length of the inner tube 4 is less than the length of the inner core 5. This design ensures a larger contact area between the wedge block 7 and the inner core 5, enhancing the fixing force. This fit ensures that the force of the wedge block 7 is evenly transmitted to the inner core 5, avoiding structural deformation or damage due to uneven pressure. This design improves the stability and reliability of the structure and reduces displacement of the inner core 5 due to insufficient fixing force. To ensure that the wedge block 7 can evenly transmit pressure and avoid structural deformation or damage, the width of the outer side of the wedge block 7 is designed to be the same as the width of the inner side of the inner core 5. This precise matching ensures uniform pressure distribution, further improving the stability and durability of the structure. The wedge block 7 is located within the area comprised of the inner tube 4, the partition plate 6, and the inner iron core 5. By adjusting the position of the wedge block 7, the inner iron core 5 can be compressed, creating the necessary assembly clearance between the inner iron core 5 and the inner wall 1 of the pump groove, ensuring assembly accuracy and reliability. To facilitate adjustment of the wedge block 7's position, a round hole is provided at the thicker end of the wedge block 7. When it is necessary to move the wedge block 7 away from the center of the inner tube 4, it can be pulled out using the round hole, thereby adjusting the assembly clearance between the inner iron core 5 and the inner wall 1 of the pump groove. This adjustment method is simple and easy to implement, and can be flexibly adjusted according to the actual assembly situation to ensure that the assembly clearance between the inner iron core 5 and the inner wall 1 of the pump groove meets the design requirements.

[0025] Installation process.

[0026] 1. Prepare materials and tools.

[0027] Before starting assembly, materials such as the pump trench inner wall 1, inner pipe 4, inner iron core 5, wedge block 7, and partition 6 need to be prepared. At the same time, the corresponding tools, such as measuring tools, should also be prepared.

[0028] 2. Assemble the inner tube 4 and the inner iron core 5.

[0029] First, place the inner tube 4 in the inner wall 1 of the pump trench. Then, evenly arrange eight partitions 6 of equal width circumferentially between the inner wall 1 and the inner tube 4, ensuring the partitions 6 are correctly positioned and that the inner tube 4 is coaxial with the inner wall 1. Next, group the inner cores 5 according to the number of partitions 6. After stacking each group of inner cores 5, place them within the area formed by the inner wall 1, the inner tube 4, and the partitions 6. Pay attention to the position and orientation of the inner cores 5.

[0030] 3. Install wedge block 7.

[0031] Eight wedge-shaped blocks 7 are arranged circumferentially at the upper and lower ends of the inner iron core 5. One side of the wedge-shaped blocks 7 has an inclination angle of 2 to 5 degrees and is in contact with the inner tube 4. The outer side is in contact with the inner side surface of the inner iron core 5. The wedge-shaped blocks 7 are driven axially into the gap between the inner iron core 5 and the inner tube 4, so that the inner iron core 5 is tightly attached to the inner wall 1 of the pump groove on the outer diameter side, which provides good support for the pump groove wall and prevents it from buckling and failing under external pressure.

[0032] 4. Adjust wedge block 7.

[0033] By adjusting the position of the wedge block 7, the inner iron core 5 is compressed, leaving the required assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove. According to actual needs, the contact point between the inclined surface 7.1 of the wedge block 7 and the end of the inner tube 4 is adjusted to adjust the degree of compression of the inner iron core 5 by the wedge block 7.

[0034] 5. Check and adjust.

[0035] After assembly, check whether the assembly gap between the inner iron core 5 and the inner wall 1 of the pump groove meets the design requirements. If necessary, the position of the wedge block 7 can be further adjusted to ensure the accuracy of the assembly gap.

[0036] 6. Welding.

[0037] After the inspection is completed, the wedge blocks 7 at both ends and the inner tube 4 are welded firmly.

[0038] 7. Fixing and sealing.

[0039] After confirming that all components are correctly installed and adjusted, fixation and sealing work is carried out. The pressure plate 3 is fixed to one end of the inner iron core 5 and pressed and fixed by the pressure plate 3. The reducing head 2 is installed and fixed at both ends of the inner wall 1 of the pump groove to ensure the stability and sealing of the fixing structure of the inner iron core 5 of the electromagnetic pump.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A core fixing structure for an electromagnetic pump, comprising an inner wall of a pump groove, an inner tube, and an inner core assembly, characterized in that: Several wedge-shaped blocks are provided along the circumferential direction between the inner core assembly and both ends of the inner tube; The wedge-shaped block has a fan-shaped cross-section, with one side being an inclined surface. The pointed end is close to the middle of the inner tube, and the other end extends out of the end of the inner tube.

2. The electromagnetic pump internal core fixing structure according to claim 1, characterized in that, Several baffles are circumferentially arranged between the inner wall of the pump trench and the inner pipe, and each inner iron core is arranged between the baffles.

3. The electromagnetic pump internal core fixing structure according to claim 2, characterized in that, The wedge-shaped block is located in the area composed of the inner tube, the partition, and the inner iron core.

4. The electromagnetic pump internal core fixing structure according to claim 1, characterized in that, The inclined surface of the wedge block contacts the outer side of the inner tube, and the outer side is in contact with the inner side of the inner iron core.

5. The electromagnetic pump internal core fixing structure according to claim 1, 3, or 4, characterized in that, The width of the outer side of the wedge block is the same as the width of the inner side of the inner iron core.

6. The inner core fixing structure of an electromagnetic pump according to claim 1 or 4, characterized in that, The inclination angle of the wedge block's inclined surface is 2 to 5 degrees.

7. The electromagnetic pump internal core fixing structure according to claim 1, characterized in that, The outer side of the inner iron core fits against the inner side of the pump groove, and there is a gap between the inner side and the inner tube.

8. The electromagnetic pump internal core fixing structure according to claim 3 or 4, characterized in that, The length of the inner tube is less than the length of the inner iron core.

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